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HD 207129
Observation data
Epoch J2000.0       Equinox J2000.0 ( ICRS)
Constellation Grus
Right ascension 21h 48m 15.7514s [1]
Declination −47° 18′ 13.014″ [1]
Apparent magnitude (V) 5.58 [1]
Characteristics
Spectral type G2V [1]
U−B color index +0.08 [2]
B−V color index +0.60 [2]
Astrometry
Radial velocity (Rv)−7.6 ± 0.2 [1] km/s
Proper motion (μ) RA: 165.64 [1]  mas/ yr
Dec.: −295.00 [1]  mas/ yr
Parallax (π)63.95 ± 0.78  mas [1]
Distance51.0 ± 0.6  ly
(15.6 ± 0.2  pc)
Absolute magnitude (MV)4.61 [3]
Details
Mass0.97+0.07
−0.05 [4]  M☉
Radius1.0 [5]  R☉
Temperature5900 [4]  K
Metallicity [Fe/H]−0.15 [4]  dex
Rotational velocity (v sin i)2 [4] km/s
Age3.8+3.6
−2.5 [4]  Gyr
Other designations
CCDM J21483-4718A, CD−47 13928, CPD−47 9758, FK5 1573, GC 30516, Gliese 838, GJ 838, HR 8323, HIP 107649, IDS 21418-4746 A, LTT 8704, NLTT 52100, PPM 327579, SAO 230846, WDS J21483-4718A. [1]
Database references
SIMBAD data

HD 207129 is a G-type pre-main-sequence star in the constellation of Grus. [1] It has an apparent visual magnitude of approximately 5.58. [1] This is a Sun-like star with the same stellar classification G2V and a similar mass. It is roughly the same age as the Sun, but has a lower abundance of elements other than hydrogen and helium; what astronomers term the star's metallicity. [4]

A debris disk has been imaged around this star in visible light using the ACS instrument on the Hubble Space Telescope; it has also been imaged in the infrared (70 μm) using the MIPS instrument on the Spitzer Space Telescope. Based on the ACS image, the disk appears to have a radius of about 163 astronomical units and to be about 30 AU wide, and to be inclined at 60° to the plane of the sky. [6]

Another star, CCDM J21483-4718B (also designated CD−47 13929 or WDS J21483-4718B), of apparent visual magnitude 8.7, has been observed 55 arcseconds away from this star, [7] but based on comparison of proper motions, it is believed to be an optical double and not physically related to its companion. [8]

References

  1. ^ a b c d e f g h i j k HD 207129 -- Pre-main sequence Star, database entry, SIMBAD. Accessed on line February 9, 2011.
  2. ^ a b HR 8323, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line February 9, 2011.
  3. ^ From apparent magnitude and parallax.
  4. ^ a b c d e f HD 207129, database entry, The Geneva-Copenhagen Survey of Solar neighbourhood, J. Holmberg et al., 2007, CDS ID V/117A. Accessed on line February 9, 2011.
  5. ^ HD 207129, database entry, Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition, L. E. Pasinetti-Fracassini, L. Pastori, S. Covino, and A. Pozzi, CDS ID II/224. Accessed on line February 9, 2011.
  6. ^ HST and Spitzer Observations of the HD 207129 Debris Ring, John E. Krist et al., The Astronomical Journal 140, #4 (October 2010), pp. 1051-1061, doi: 10.1088/0004-6256/140/4/1051, Bibcode: 2010AJ....140.1051K.
  7. ^ CCDM J21483-4718, database entry, CCDM (Catalog of Components of Double & Multiple stars), J. Dommanget and O. Nys, second edition, 2002, VizieR database I/274.
  8. ^ Notes, WDS 21483-4718, The Washington Double Star Catalog, B. D. Mason et al., version 2011-02-06, VizieR database B/wds.
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